NEW YORK (1010 WINS/WCBS 880) — The second phase of “Leandra’s Law” is going into effect this Sunday.

Earlier this week, Carmen Huertas, 32, pleaded guilty to driving drunk in the crash that killed the 11-year-old Leandra Rosado and injured six other girls left in her care for an ill-fated ride to a slumber party last October.

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Rosado’s death led to the passage of “Leandra’s Law” which made it a felony to drive drunk with a child younger than 15 in the car.

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Now, anyone sentenced for DWI, including first time offenders, on or after Aug. 15 will have to install and maintain an interlocking ignition device in their car. The device prevents a vehicle from starting if the operator is under the influence of alcohol.

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Gov. David Paterson said Thursday that the device decreases vehicular homicides by 35 percent.

“I’m calling this the final knock-out punch,” Lenny Rosado said. “This will definitely put away people that think it’s okay to drink and drive.”

Jennifer Flynn, whose 7-year-old daughter, Katie, was killed by a drunken driver on Long Island in July 2005, says making the device mandatory for those convicted will emphasize the seriousness of the offense.

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“I think that for too long people are less afraid to shoplift than they are to drink and drive that socially we accept it,” Flynn said.